net:fec: implement almost zero-copy receive path

iMX6 SoCs have an IP accelerator which can pad and strip two bytes in
the FIFO at the beginning of each packet.  Since the FEC has alignment
restrictions on the buffer addresses, this feature is particularly
interesting for receive as it allows us to receive an appropriately
aligned packet for IP.

This allows us to reduce the CPU overhead by avoiding copying large
packets - and in the spirit of all network drivers which use this trick,
we provide a copybreak tunable which allows the packet size to be
copied to be adjusted.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

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